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Global Warming Dbq

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From 1880s to now, many measurements have shown that the temperature of the earth is rising, and what causes the temperature rising? Scientists did not get the certain answer, they pointed out some possible factors, including:
(1)Greenhouse effect: the earth is full of greenhouse gas, until cyanobacteria reduced the concentration of carbon dioxide, (2) Plate movement and volcanic eruption: plate movement and volcanic eruptions cause greenhouse gases to cover the earth. So human beings increase greenhouse gas emissions may lead to climate change. But, in 2010, Chinese scientists pointed out that there is no direct relationship between carbon dioxide concentration and global temperature. He said that some areas of the earth are extremely

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